sound/soc/codecs/wm8776.c - kernel/msm-5.4 - Gitiles

 /*
  * wm8776.c  --  WM8776 ALSA SoC Audio driver
  *
  * Copyright 2009 Wolfson Microelectronics plc
  *
  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  *
  * TODO: Input ALC/limiter support
  */

 #include <linux/module.h>
 #include <linux/moduleparam.h>
 #include <linux/init.h>
 #include <linux/delay.h>
 #include <linux/pm.h>
 #include <linux/i2c.h>
 #include <linux/platform_device.h>
 #include <linux/spi/spi.h>
 #include <linux/slab.h>
 #include <sound/core.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
 #include <sound/soc-dapm.h>
 #include <sound/initval.h>
 #include <sound/tlv.h>

 #include "wm8776.h"

 static struct snd_soc_codec *wm8776_codec;
 struct snd_soc_codec_device soc_codec_dev_wm8776;

 /* codec private data */
 struct wm8776_priv {
 	struct snd_soc_codec codec;
 	u16 reg_cache[WM8776_CACHEREGNUM];
 	int sysclk[2];
 };

 #ifdef CONFIG_SPI_MASTER
 static int wm8776_spi_write(struct spi_device *spi, const char *data, int len);
 #endif

 static const u16 wm8776_reg[WM8776_CACHEREGNUM] = {
 	0x79, 0x79, 0x79, 0xff, 0xff,  /* 4 */
 	0xff, 0x00, 0x90, 0x00, 0x00,  /* 9 */
 	0x22, 0x22, 0x22, 0x08, 0xcf,  /* 14 */
 	0xcf, 0x7b, 0x00, 0x32, 0x00,  /* 19 */
 	0xa6, 0x01, 0x01
 };

 static int wm8776_reset(struct snd_soc_codec *codec)
 {
 	return snd_soc_write(codec, WM8776_RESET, 0);
 }

 static const DECLARE_TLV_DB_SCALE(hp_tlv, -12100, 100, 1);
 static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
 static const DECLARE_TLV_DB_SCALE(adc_tlv, -10350, 50, 1);

 static const struct snd_kcontrol_new wm8776_snd_controls[] = {
 SOC_DOUBLE_R_TLV("Headphone Playback Volume", WM8776_HPLVOL, WM8776_HPRVOL,
 		 0, 127, 0, hp_tlv),
 SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8776_DACLVOL, WM8776_DACRVOL,
 		 0, 255, 0, dac_tlv),
 SOC_SINGLE("Digital Playback ZC Switch", WM8776_DACCTRL1, 0, 1, 0),

 SOC_SINGLE("Deemphasis Switch", WM8776_DACCTRL2, 0, 1, 0),

 SOC_DOUBLE_R_TLV("Capture Volume", WM8776_ADCLVOL, WM8776_ADCRVOL,
 		 0, 255, 0, adc_tlv),
 SOC_DOUBLE("Capture Switch", WM8776_ADCMUX, 7, 6, 1, 1),
 SOC_DOUBLE_R("Capture ZC Switch", WM8776_ADCLVOL, WM8776_ADCRVOL, 8, 1, 0),
 SOC_SINGLE("Capture HPF Switch", WM8776_ADCIFCTRL, 8, 1, 1),
 };

 static const struct snd_kcontrol_new inmix_controls[] = {
 SOC_DAPM_SINGLE("AIN1 Switch", WM8776_ADCMUX, 0, 1, 0),
 SOC_DAPM_SINGLE("AIN2 Switch", WM8776_ADCMUX, 1, 1, 0),
 SOC_DAPM_SINGLE("AIN3 Switch", WM8776_ADCMUX, 2, 1, 0),
 SOC_DAPM_SINGLE("AIN4 Switch", WM8776_ADCMUX, 3, 1, 0),
 SOC_DAPM_SINGLE("AIN5 Switch", WM8776_ADCMUX, 4, 1, 0),
 };

 static const struct snd_kcontrol_new outmix_controls[] = {
 SOC_DAPM_SINGLE("DAC Switch", WM8776_OUTMUX, 0, 1, 0),
 SOC_DAPM_SINGLE("AUX Switch", WM8776_OUTMUX, 1, 1, 0),
 SOC_DAPM_SINGLE("Bypass Switch", WM8776_OUTMUX, 2, 1, 0),
 };

 static const struct snd_soc_dapm_widget wm8776_dapm_widgets[] = {
 SND_SOC_DAPM_INPUT("AUX"),
 SND_SOC_DAPM_INPUT("AUX"),

 SND_SOC_DAPM_INPUT("AIN1"),
 SND_SOC_DAPM_INPUT("AIN2"),
 SND_SOC_DAPM_INPUT("AIN3"),
 SND_SOC_DAPM_INPUT("AIN4"),
 SND_SOC_DAPM_INPUT("AIN5"),

 SND_SOC_DAPM_MIXER("Input Mixer", WM8776_PWRDOWN, 6, 1,
 		   inmix_controls, ARRAY_SIZE(inmix_controls)),

 SND_SOC_DAPM_ADC("ADC", "Capture", WM8776_PWRDOWN, 1, 1),
 SND_SOC_DAPM_DAC("DAC", "Playback", WM8776_PWRDOWN, 2, 1),

 SND_SOC_DAPM_MIXER("Output Mixer", SND_SOC_NOPM, 0, 0,
 		   outmix_controls, ARRAY_SIZE(outmix_controls)),

 SND_SOC_DAPM_PGA("Headphone PGA", WM8776_PWRDOWN, 3, 1, NULL, 0),

 SND_SOC_DAPM_OUTPUT("VOUT"),

 SND_SOC_DAPM_OUTPUT("HPOUTL"),
 SND_SOC_DAPM_OUTPUT("HPOUTR"),
 };

 static const struct snd_soc_dapm_route routes[] = {
 	{ "Input Mixer", "AIN1 Switch", "AIN1" },
 	{ "Input Mixer", "AIN2 Switch", "AIN2" },
 	{ "Input Mixer", "AIN3 Switch", "AIN3" },
 	{ "Input Mixer", "AIN4 Switch", "AIN4" },
 	{ "Input Mixer", "AIN5 Switch", "AIN5" },

 	{ "ADC", NULL, "Input Mixer" },

 	{ "Output Mixer", "DAC Switch", "DAC" },
 	{ "Output Mixer", "AUX Switch", "AUX" },
 	{ "Output Mixer", "Bypass Switch", "Input Mixer" },

 	{ "VOUT", NULL, "Output Mixer" },

 	{ "Headphone PGA", NULL, "Output Mixer" },

 	{ "HPOUTL", NULL, "Headphone PGA" },
 	{ "HPOUTR", NULL, "Headphone PGA" },
 };

 static int wm8776_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	int reg, iface, master;

 	switch (dai->id) {
 	case WM8776_DAI_DAC:
 		reg = WM8776_DACIFCTRL;
 		master = 0x80;
 		break;
 	case WM8776_DAI_ADC:
 		reg = WM8776_ADCIFCTRL;
 		master = 0x100;
 		break;
 	default:
 		return -EINVAL;
 	}

 	iface = 0;

 	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
 	case SND_SOC_DAIFMT_CBM_CFM:
 		break;
 	case SND_SOC_DAIFMT_CBS_CFS:
 		master = 0;
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
 	case SND_SOC_DAIFMT_I2S:
 		iface |= 0x0002;
 		break;
 	case SND_SOC_DAIFMT_RIGHT_J:
 		break;
 	case SND_SOC_DAIFMT_LEFT_J:
 		iface |= 0x0001;
 		break;
 		/* FIXME: CHECK A/B */
 	case SND_SOC_DAIFMT_DSP_A:
 		iface |= 0x0003;
 		break;
 	case SND_SOC_DAIFMT_DSP_B:
 		iface |= 0x0007;
 		break;
 	default:
 		return -EINVAL;
 	}

 	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
 	case SND_SOC_DAIFMT_NB_NF:
 		break;
 	case SND_SOC_DAIFMT_IB_IF:
 		iface |= 0x00c;
 		break;
 	case SND_SOC_DAIFMT_IB_NF:
 		iface |= 0x008;
 		break;
 	case SND_SOC_DAIFMT_NB_IF:
 		iface |= 0x004;
 		break;
 	default:
 		return -EINVAL;
 	}

 	/* Finally, write out the values */
 	snd_soc_update_bits(codec, reg, 0xf, iface);
 	snd_soc_update_bits(codec, WM8776_MSTRCTRL, 0x180, master);

 	return 0;
 }

 static int mclk_ratios[] = {
 	128,
 	192,
 	256,
 	384,
 	512,
 	768,
 };

 static int wm8776_hw_params(struct snd_pcm_substream *substream,
 			    struct snd_pcm_hw_params *params,
 			    struct snd_soc_dai *dai)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	struct wm8776_priv *wm8776 = snd_soc_codec_get_drvdata(codec);
 	int iface_reg, iface;
 	int ratio_shift, master;
 	int i;

 	iface = 0;

 	switch (dai->id) {
 	case WM8776_DAI_DAC:
 		iface_reg = WM8776_DACIFCTRL;
 		master = 0x80;
 		ratio_shift = 4;
 		break;
 	case WM8776_DAI_ADC:
 		iface_reg = WM8776_ADCIFCTRL;
 		master = 0x100;
 		ratio_shift = 0;
 		break;
 	default:
 		return -EINVAL;
 	}


 	/* Set word length */
 	switch (params_format(params)) {
 	case SNDRV_PCM_FORMAT_S16_LE:
 		break;
 	case SNDRV_PCM_FORMAT_S20_3LE:
 		iface |= 0x10;
 		break;
 	case SNDRV_PCM_FORMAT_S24_LE:
 		iface |= 0x20;
 		break;
 	case SNDRV_PCM_FORMAT_S32_LE:
 		iface |= 0x30;
 		break;
 	}

 	/* Only need to set MCLK/LRCLK ratio if we're master */
 	if (snd_soc_read(codec, WM8776_MSTRCTRL) & master) {
 		for (i = 0; i < ARRAY_SIZE(mclk_ratios); i++) {
 			if (wm8776->sysclk[dai->id] / params_rate(params)
 			    == mclk_ratios[i])
 				break;
 		}

 		if (i == ARRAY_SIZE(mclk_ratios)) {
 			dev_err(codec->dev,
 				"Unable to configure MCLK ratio %d/%d\n",
 				wm8776->sysclk[dai->id], params_rate(params));
 			return -EINVAL;
 		}

 		dev_dbg(codec->dev, "MCLK is %dfs\n", mclk_ratios[i]);

 		snd_soc_update_bits(codec, WM8776_MSTRCTRL,
 				    0x7 << ratio_shift, i << ratio_shift);
 	} else {
 		dev_dbg(codec->dev, "DAI in slave mode\n");
 	}

 	snd_soc_update_bits(codec, iface_reg, 0x30, iface);

 	return 0;
 }

 static int wm8776_mute(struct snd_soc_dai *dai, int mute)
 {
 	struct snd_soc_codec *codec = dai->codec;

 	return snd_soc_write(codec, WM8776_DACMUTE, !!mute);
 }

 static int wm8776_set_sysclk(struct snd_soc_dai *dai,
 			     int clk_id, unsigned int freq, int dir)
 {
 	struct snd_soc_codec *codec = dai->codec;
 	struct wm8776_priv *wm8776 = snd_soc_codec_get_drvdata(codec);

 	BUG_ON(dai->id >= ARRAY_SIZE(wm8776->sysclk));

 	wm8776->sysclk[dai->id] = freq;

 	return 0;
 }

 static int wm8776_set_bias_level(struct snd_soc_codec *codec,
 				 enum snd_soc_bias_level level)
 {
 	switch (level) {
 	case SND_SOC_BIAS_ON:
 		break;
 	case SND_SOC_BIAS_PREPARE:
 		break;
 	case SND_SOC_BIAS_STANDBY:
 		if (codec->bias_level == SND_SOC_BIAS_OFF) {
 			/* Disable the global powerdown; DAPM does the rest */
 			snd_soc_update_bits(codec, WM8776_PWRDOWN, 1, 0);
 		}

 		break;
 	case SND_SOC_BIAS_OFF:
 		snd_soc_update_bits(codec, WM8776_PWRDOWN, 1, 1);
 		break;
 	}

 	codec->bias_level = level;
 	return 0;
 }

 #define WM8776_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
 		      SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
 		      SNDRV_PCM_RATE_96000)


 #define WM8776_FORMATS (SNDRV_PCM_FMTBIT_S16_LE | SNDRV_PCM_FMTBIT_S20_3LE |\
 			SNDRV_PCM_FMTBIT_S24_LE | SNDRV_PCM_FMTBIT_S32_LE)

 static struct snd_soc_dai_ops wm8776_dac_ops = {
 	.digital_mute	= wm8776_mute,
 	.hw_params      = wm8776_hw_params,
 	.set_fmt        = wm8776_set_fmt,
 	.set_sysclk     = wm8776_set_sysclk,
 };

 static struct snd_soc_dai_ops wm8776_adc_ops = {
 	.hw_params      = wm8776_hw_params,
 	.set_fmt        = wm8776_set_fmt,
 	.set_sysclk     = wm8776_set_sysclk,
 };

 struct snd_soc_dai wm8776_dai[] = {
 	{
 		.name = "WM8776 Playback",
 		.id = WM8776_DAI_DAC,
 		.playback = {
 			.stream_name = "Playback",
 			.channels_min = 2,
 			.channels_max = 2,
 			.rates = WM8776_RATES,
 			.formats = WM8776_FORMATS,
 		},
 		.ops = &wm8776_dac_ops,
 	},
 	{
 		.name = "WM8776 Capture",
 		.id = WM8776_DAI_ADC,
 		.capture = {
 			.stream_name = "Capture",
 			.channels_min = 2,
 			.channels_max = 2,
 			.rates = WM8776_RATES,
 			.formats = WM8776_FORMATS,
 		},
 		.ops = &wm8776_adc_ops,
 	},
 };
 EXPORT_SYMBOL_GPL(wm8776_dai);

 #ifdef CONFIG_PM
 static int wm8776_suspend(struct platform_device *pdev, pm_message_t state)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec = socdev->card->codec;

 	wm8776_set_bias_level(codec, SND_SOC_BIAS_OFF);

 	return 0;
 }

 static int wm8776_resume(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec = socdev->card->codec;
 	int i;
 	u8 data[2];
 	u16 *cache = codec->reg_cache;

 	/* Sync reg_cache with the hardware */
 	for (i = 0; i < ARRAY_SIZE(wm8776_reg); i++) {
 		if (cache[i] == wm8776_reg[i])
 			continue;
 		data[0] = (i << 1) | ((cache[i] >> 8) & 0x0001);
 		data[1] = cache[i] & 0x00ff;
 		codec->hw_write(codec->control_data, data, 2);
 	}

 	wm8776_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

 	return 0;
 }
 #else
 #define wm8776_suspend NULL
 #define wm8776_resume NULL
 #endif

 static int wm8776_probe(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
 	struct snd_soc_codec *codec;
 	int ret = 0;

 	if (wm8776_codec == NULL) {
 		dev_err(&pdev->dev, "Codec device not registered\n");
 		return -ENODEV;
 	}

 	socdev->card->codec = wm8776_codec;
 	codec = wm8776_codec;

 	/* register pcms */
 	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
 	if (ret < 0) {
 		dev_err(codec->dev, "failed to create pcms: %d\n", ret);
 		goto pcm_err;
 	}

 	snd_soc_add_controls(codec, wm8776_snd_controls,
 			     ARRAY_SIZE(wm8776_snd_controls));
 	snd_soc_dapm_new_controls(codec, wm8776_dapm_widgets,
 				  ARRAY_SIZE(wm8776_dapm_widgets));
 	snd_soc_dapm_add_routes(codec, routes, ARRAY_SIZE(routes));

 	return ret;

 pcm_err:
 	return ret;
 }

 /* power down chip */
 static int wm8776_remove(struct platform_device *pdev)
 {
 	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

 	snd_soc_free_pcms(socdev);
 	snd_soc_dapm_free(socdev);

 	return 0;
 }

 struct snd_soc_codec_device soc_codec_dev_wm8776 = {
 	.probe = 	wm8776_probe,
 	.remove = 	wm8776_remove,
 	.suspend = 	wm8776_suspend,
 	.resume =	wm8776_resume,
 };
 EXPORT_SYMBOL_GPL(soc_codec_dev_wm8776);

 static int wm8776_register(struct wm8776_priv *wm8776,
 			   enum snd_soc_control_type control)
 {
 	int ret, i;
 	struct snd_soc_codec *codec = &wm8776->codec;

 	if (wm8776_codec) {
 		dev_err(codec->dev, "Another WM8776 is registered\n");
 		ret = -EINVAL;
 		goto err;
 	}

 	mutex_init(&codec->mutex);
 	INIT_LIST_HEAD(&codec->dapm_widgets);
 	INIT_LIST_HEAD(&codec->dapm_paths);

 	snd_soc_codec_set_drvdata(codec, wm8776);
 	codec->name = "WM8776";
 	codec->owner = THIS_MODULE;
 	codec->bias_level = SND_SOC_BIAS_OFF;
 	codec->set_bias_level = wm8776_set_bias_level;
 	codec->dai = wm8776_dai;
 	codec->num_dai = ARRAY_SIZE(wm8776_dai);
 	codec->reg_cache_size = WM8776_CACHEREGNUM;
 	codec->reg_cache = &wm8776->reg_cache;

 	memcpy(codec->reg_cache, wm8776_reg, sizeof(wm8776_reg));

 	ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
 	if (ret < 0) {
 		dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
 		goto err;
 	}

 	for (i = 0; i < ARRAY_SIZE(wm8776_dai); i++)
 		wm8776_dai[i].dev = codec->dev;

 	ret = wm8776_reset(codec);
 	if (ret < 0) {
 		dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
 		goto err;
 	}

 	wm8776_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

 	/* Latch the update bits; right channel only since we always
 	 * update both. */
 	snd_soc_update_bits(codec, WM8776_HPRVOL, 0x100, 0x100);
 	snd_soc_update_bits(codec, WM8776_DACRVOL, 0x100, 0x100);

 	wm8776_codec = codec;

 	ret = snd_soc_register_codec(codec);
 	if (ret != 0) {
 		dev_err(codec->dev, "Failed to register codec: %d\n", ret);
 		goto err;
 	}

 	ret = snd_soc_register_dais(wm8776_dai, ARRAY_SIZE(wm8776_dai));
 	if (ret != 0) {
 		dev_err(codec->dev, "Failed to register DAIs: %d\n", ret);
 		goto err_codec;
 	}

 	return 0;

 err_codec:
 	snd_soc_unregister_codec(codec);
 err:
 	kfree(wm8776);
 	return ret;
 }

 static void wm8776_unregister(struct wm8776_priv *wm8776)
 {
 	wm8776_set_bias_level(&wm8776->codec, SND_SOC_BIAS_OFF);
 	snd_soc_unregister_dais(wm8776_dai, ARRAY_SIZE(wm8776_dai));
 	snd_soc_unregister_codec(&wm8776->codec);
 	kfree(wm8776);
 	wm8776_codec = NULL;
 }

 #if defined(CONFIG_SPI_MASTER)
 static int wm8776_spi_write(struct spi_device *spi, const char *data, int len)
 {
 	struct spi_transfer t;
 	struct spi_message m;
 	u8 msg[2];

 	if (len <= 0)
 		return 0;

 	msg[0] = data[0];
 	msg[1] = data[1];

 	spi_message_init(&m);
 	memset(&t, 0, (sizeof t));

 	t.tx_buf = &msg[0];
 	t.len = len;

 	spi_message_add_tail(&t, &m);
 	spi_sync(spi, &m);

 	return len;
 }

 static int __devinit wm8776_spi_probe(struct spi_device *spi)
 {
 	struct snd_soc_codec *codec;
 	struct wm8776_priv *wm8776;

 	wm8776 = kzalloc(sizeof(struct wm8776_priv), GFP_KERNEL);
 	if (wm8776 == NULL)
 		return -ENOMEM;

 	codec = &wm8776->codec;
 	codec->control_data = spi;
 	codec->hw_write = (hw_write_t)wm8776_spi_write;
 	codec->dev = &spi->dev;

 	dev_set_drvdata(&spi->dev, wm8776);

 	return wm8776_register(wm8776, SND_SOC_SPI);
 }

 static int __devexit wm8776_spi_remove(struct spi_device *spi)
 {
 	struct wm8776_priv *wm8776 = dev_get_drvdata(&spi->dev);

 	wm8776_unregister(wm8776);

 	return 0;
 }

 static struct spi_driver wm8776_spi_driver = {
 	.driver = {
 		.name	= "wm8776",
 		.bus	= &spi_bus_type,
 		.owner	= THIS_MODULE,
 	},
 	.probe		= wm8776_spi_probe,
 	.remove		= __devexit_p(wm8776_spi_remove),
 };
 #endif /* CONFIG_SPI_MASTER */

 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 static __devinit int wm8776_i2c_probe(struct i2c_client *i2c,
 				      const struct i2c_device_id *id)
 {
 	struct wm8776_priv *wm8776;
 	struct snd_soc_codec *codec;

 	wm8776 = kzalloc(sizeof(struct wm8776_priv), GFP_KERNEL);
 	if (wm8776 == NULL)
 		return -ENOMEM;

 	codec = &wm8776->codec;
 	codec->hw_write = (hw_write_t)i2c_master_send;

 	i2c_set_clientdata(i2c, wm8776);
 	codec->control_data = i2c;

 	codec->dev = &i2c->dev;

 	return wm8776_register(wm8776, SND_SOC_I2C);
 }

 static __devexit int wm8776_i2c_remove(struct i2c_client *client)
 {
 	struct wm8776_priv *wm8776 = i2c_get_clientdata(client);
 	wm8776_unregister(wm8776);
 	return 0;
 }

 static const struct i2c_device_id wm8776_i2c_id[] = {
 	{ "wm8776", 0 },
 	{ }
 };
 MODULE_DEVICE_TABLE(i2c, wm8776_i2c_id);

 static struct i2c_driver wm8776_i2c_driver = {
 	.driver = {
 		.name = "wm8776",
 		.owner = THIS_MODULE,
 	},
 	.probe =    wm8776_i2c_probe,
 	.remove =   __devexit_p(wm8776_i2c_remove),
 	.id_table = wm8776_i2c_id,
 };
 #endif

 static int __init wm8776_modinit(void)
 {
 	int ret;
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	ret = i2c_add_driver(&wm8776_i2c_driver);
 	if (ret != 0) {
 		printk(KERN_ERR "Failed to register WM8776 I2C driver: %d\n",
 		       ret);
 	}
 #endif
 #if defined(CONFIG_SPI_MASTER)
 	ret = spi_register_driver(&wm8776_spi_driver);
 	if (ret != 0) {
 		printk(KERN_ERR "Failed to register WM8776 SPI driver: %d\n",
 		       ret);
 	}
 #endif
 	return 0;
 }
 module_init(wm8776_modinit);

 static void __exit wm8776_exit(void)
 {
 #if defined(CONFIG_I2C) || defined(CONFIG_I2C_MODULE)
 	i2c_del_driver(&wm8776_i2c_driver);
 #endif
 #if defined(CONFIG_SPI_MASTER)
 	spi_unregister_driver(&wm8776_spi_driver);
 #endif
 }
 module_exit(wm8776_exit);

 MODULE_DESCRIPTION("ASoC WM8776 driver");
 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
 MODULE_LICENSE("GPL");
	/*
	* wm8776.c -- WM8776 ALSA SoC Audio driver
	*
	* Copyright 2009 Wolfson Microelectronics plc
	*
	* Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation.
	*
	* TODO: Input ALC/limiter support
	*/

	#include <linux/module.h>
	#include <linux/moduleparam.h>
	#include <linux/init.h>
	#include <linux/delay.h>
	#include <linux/pm.h>
	#include <linux/i2c.h>
	#include <linux/platform_device.h>
	#include <linux/spi/spi.h>
	#include <linux/slab.h>
	#include <sound/core.h>
	#include <sound/pcm.h>
	#include <sound/pcm_params.h>
	#include <sound/soc.h>
	#include <sound/soc-dapm.h>
	#include <sound/initval.h>
	#include <sound/tlv.h>

	#include "wm8776.h"

	static struct snd_soc_codec *wm8776_codec;
	struct snd_soc_codec_device soc_codec_dev_wm8776;

	/* codec private data */
	struct wm8776_priv {
	struct snd_soc_codec codec;
	u16 reg_cache[WM8776_CACHEREGNUM];
	int sysclk[2];
	};

	#ifdef CONFIG_SPI_MASTER
	static int wm8776_spi_write(struct spi_device spi, const char data, int len);
	#endif

	static const u16 wm8776_reg[WM8776_CACHEREGNUM] = {
	0x79, 0x79, 0x79, 0xff, 0xff, /* 4 */
	0xff, 0x00, 0x90, 0x00, 0x00, /* 9 */
	0x22, 0x22, 0x22, 0x08, 0xcf, /* 14 */
	0xcf, 0x7b, 0x00, 0x32, 0x00, /* 19 */
	0xa6, 0x01, 0x01
	};

	static int wm8776_reset(struct snd_soc_codec *codec)
	{
	return snd_soc_write(codec, WM8776_RESET, 0);
	}

	static const DECLARE_TLV_DB_SCALE(hp_tlv, -12100, 100, 1);
	static const DECLARE_TLV_DB_SCALE(dac_tlv, -12750, 50, 1);
	static const DECLARE_TLV_DB_SCALE(adc_tlv, -10350, 50, 1);

	static const struct snd_kcontrol_new wm8776_snd_controls[] = {
	SOC_DOUBLE_R_TLV("Headphone Playback Volume", WM8776_HPLVOL, WM8776_HPRVOL,
	0, 127, 0, hp_tlv),
	SOC_DOUBLE_R_TLV("Digital Playback Volume", WM8776_DACLVOL, WM8776_DACRVOL,
	0, 255, 0, dac_tlv),
	SOC_SINGLE("Digital Playback ZC Switch", WM8776_DACCTRL1, 0, 1, 0),

	SOC_SINGLE("Deemphasis Switch", WM8776_DACCTRL2, 0, 1, 0),

	SOC_DOUBLE_R_TLV("Capture Volume", WM8776_ADCLVOL, WM8776_ADCRVOL,
	0, 255, 0, adc_tlv),
	SOC_DOUBLE("Capture Switch", WM8776_ADCMUX, 7, 6, 1, 1),
	SOC_DOUBLE_R("Capture ZC Switch", WM8776_ADCLVOL, WM8776_ADCRVOL, 8, 1, 0),
	SOC_SINGLE("Capture HPF Switch", WM8776_ADCIFCTRL, 8, 1, 1),
	};

	static const struct snd_kcontrol_new inmix_controls[] = {
	SOC_DAPM_SINGLE("AIN1 Switch", WM8776_ADCMUX, 0, 1, 0),
	SOC_DAPM_SINGLE("AIN2 Switch", WM8776_ADCMUX, 1, 1, 0),
	SOC_DAPM_SINGLE("AIN3 Switch", WM8776_ADCMUX, 2, 1, 0),
	SOC_DAPM_SINGLE("AIN4 Switch", WM8776_ADCMUX, 3, 1, 0),
	SOC_DAPM_SINGLE("AIN5 Switch", WM8776_ADCMUX, 4, 1, 0),
	};

	static const struct snd_kcontrol_new outmix_controls[] = {
	SOC_DAPM_SINGLE("DAC Switch", WM8776_OUTMUX, 0, 1, 0),
	SOC_DAPM_SINGLE("AUX Switch", WM8776_OUTMUX, 1, 1, 0),
	SOC_DAPM_SINGLE("Bypass Switch", WM8776_OUTMUX, 2, 1, 0),
	};

	static const struct snd_soc_dapm_widget wm8776_dapm_widgets[] = {
	SND_SOC_DAPM_INPUT("AUX"),
	SND_SOC_DAPM_INPUT("AUX"),

	SND_SOC_DAPM_INPUT("AIN1"),
	SND_SOC_DAPM_INPUT("AIN2"),
	SND_SOC_DAPM_INPUT("AIN3"),
	SND_SOC_DAPM_INPUT("AIN4"),
	SND_SOC_DAPM_INPUT("AIN5"),

	SND_SOC_DAPM_MIXER("Input Mixer", WM8776_PWRDOWN, 6, 1,
	inmix_controls, ARRAY_SIZE(inmix_controls)),

	SND_SOC_DAPM_ADC("ADC", "Capture", WM8776_PWRDOWN, 1, 1),
	SND_SOC_DAPM_DAC("DAC", "Playback", WM8776_PWRDOWN, 2, 1),

	SND_SOC_DAPM_MIXER("Output Mixer", SND_SOC_NOPM, 0, 0,
	outmix_controls, ARRAY_SIZE(outmix_controls)),

	SND_SOC_DAPM_PGA("Headphone PGA", WM8776_PWRDOWN, 3, 1, NULL, 0),

	SND_SOC_DAPM_OUTPUT("VOUT"),

	SND_SOC_DAPM_OUTPUT("HPOUTL"),
	SND_SOC_DAPM_OUTPUT("HPOUTR"),
	};

	static const struct snd_soc_dapm_route routes[] = {
	{ "Input Mixer", "AIN1 Switch", "AIN1" },
	{ "Input Mixer", "AIN2 Switch", "AIN2" },
	{ "Input Mixer", "AIN3 Switch", "AIN3" },
	{ "Input Mixer", "AIN4 Switch", "AIN4" },
	{ "Input Mixer", "AIN5 Switch", "AIN5" },

	{ "ADC", NULL, "Input Mixer" },

	{ "Output Mixer", "DAC Switch", "DAC" },
	{ "Output Mixer", "AUX Switch", "AUX" },
	{ "Output Mixer", "Bypass Switch", "Input Mixer" },

	{ "VOUT", NULL, "Output Mixer" },

	{ "Headphone PGA", NULL, "Output Mixer" },

	{ "HPOUTL", NULL, "Headphone PGA" },
	{ "HPOUTR", NULL, "Headphone PGA" },
	};

	static int wm8776_set_fmt(struct snd_soc_dai *dai, unsigned int fmt)
	{
	struct snd_soc_codec *codec = dai->codec;
	int reg, iface, master;

	switch (dai->id) {
	case WM8776_DAI_DAC:
	reg = WM8776_DACIFCTRL;
	master = 0x80;
	break;
	case WM8776_DAI_ADC:
	reg = WM8776_ADCIFCTRL;
	master = 0x100;
	break;
	default:
	return -EINVAL;
	}

	iface = 0;

	switch (fmt & SND_SOC_DAIFMT_MASTER_MASK) {
	case SND_SOC_DAIFMT_CBM_CFM:
	break;
	case SND_SOC_DAIFMT_CBS_CFS:
	master = 0;
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_FORMAT_MASK) {
	case SND_SOC_DAIFMT_I2S:
	iface \|= 0x0002;
	break;
	case SND_SOC_DAIFMT_RIGHT_J:
	break;
	case SND_SOC_DAIFMT_LEFT_J:
	iface \|= 0x0001;
	break;
	/* FIXME: CHECK A/B */
	case SND_SOC_DAIFMT_DSP_A:
	iface \|= 0x0003;
	break;
	case SND_SOC_DAIFMT_DSP_B:
	iface \|= 0x0007;
	break;
	default:
	return -EINVAL;
	}

	switch (fmt & SND_SOC_DAIFMT_INV_MASK) {
	case SND_SOC_DAIFMT_NB_NF:
	break;
	case SND_SOC_DAIFMT_IB_IF:
	iface \|= 0x00c;
	break;
	case SND_SOC_DAIFMT_IB_NF:
	iface \|= 0x008;
	break;
	case SND_SOC_DAIFMT_NB_IF:
	iface \|= 0x004;
	break;
	default:
	return -EINVAL;
	}

	/* Finally, write out the values */
	snd_soc_update_bits(codec, reg, 0xf, iface);
	snd_soc_update_bits(codec, WM8776_MSTRCTRL, 0x180, master);

	return 0;
	}

	static int mclk_ratios[] = {
	128,
	192,
	256,
	384,
	512,
	768,
	};

	static int wm8776_hw_params(struct snd_pcm_substream *substream,
	struct snd_pcm_hw_params *params,
	struct snd_soc_dai *dai)
	{
	struct snd_soc_codec *codec = dai->codec;
	struct wm8776_priv *wm8776 = snd_soc_codec_get_drvdata(codec);
	int iface_reg, iface;
	int ratio_shift, master;
	int i;

	iface = 0;

	switch (dai->id) {
	case WM8776_DAI_DAC:
	iface_reg = WM8776_DACIFCTRL;
	master = 0x80;
	ratio_shift = 4;
	break;
	case WM8776_DAI_ADC:
	iface_reg = WM8776_ADCIFCTRL;
	master = 0x100;
	ratio_shift = 0;
	break;
	default:
	return -EINVAL;
	}


	/* Set word length */
	switch (params_format(params)) {
	case SNDRV_PCM_FORMAT_S16_LE:
	break;
	case SNDRV_PCM_FORMAT_S20_3LE:
	iface \|= 0x10;
	break;
	case SNDRV_PCM_FORMAT_S24_LE:
	iface \|= 0x20;
	break;
	case SNDRV_PCM_FORMAT_S32_LE:
	iface \|= 0x30;
	break;
	}

	/* Only need to set MCLK/LRCLK ratio if we're master */
	if (snd_soc_read(codec, WM8776_MSTRCTRL) & master) {
	for (i = 0; i < ARRAY_SIZE(mclk_ratios); i++) {
	if (wm8776->sysclk[dai->id] / params_rate(params)
	== mclk_ratios[i])
	break;
	}

	if (i == ARRAY_SIZE(mclk_ratios)) {
	dev_err(codec->dev,
	"Unable to configure MCLK ratio %d/%d\n",
	wm8776->sysclk[dai->id], params_rate(params));
	return -EINVAL;
	}

	dev_dbg(codec->dev, "MCLK is %dfs\n", mclk_ratios[i]);

	snd_soc_update_bits(codec, WM8776_MSTRCTRL,
	0x7 << ratio_shift, i << ratio_shift);
	} else {
	dev_dbg(codec->dev, "DAI in slave mode\n");
	}

	snd_soc_update_bits(codec, iface_reg, 0x30, iface);

	return 0;
	}

	static int wm8776_mute(struct snd_soc_dai *dai, int mute)
	{
	struct snd_soc_codec *codec = dai->codec;

	return snd_soc_write(codec, WM8776_DACMUTE, !!mute);
	}

	static int wm8776_set_sysclk(struct snd_soc_dai *dai,
	int clk_id, unsigned int freq, int dir)
	{
	struct snd_soc_codec *codec = dai->codec;
	struct wm8776_priv *wm8776 = snd_soc_codec_get_drvdata(codec);

	BUG_ON(dai->id >= ARRAY_SIZE(wm8776->sysclk));

	wm8776->sysclk[dai->id] = freq;

	return 0;
	}

	static int wm8776_set_bias_level(struct snd_soc_codec *codec,
	enum snd_soc_bias_level level)
	{
	switch (level) {
	case SND_SOC_BIAS_ON:
	break;
	case SND_SOC_BIAS_PREPARE:
	break;
	case SND_SOC_BIAS_STANDBY:
	if (codec->bias_level == SND_SOC_BIAS_OFF) {
	/* Disable the global powerdown; DAPM does the rest */
	snd_soc_update_bits(codec, WM8776_PWRDOWN, 1, 0);
	}

	break;
	case SND_SOC_BIAS_OFF:
	snd_soc_update_bits(codec, WM8776_PWRDOWN, 1, 1);
	break;
	}

	codec->bias_level = level;
	return 0;
	}

	#define WM8776_RATES (SNDRV_PCM_RATE_32000 \| SNDRV_PCM_RATE_44100 \|\
	SNDRV_PCM_RATE_48000 \| SNDRV_PCM_RATE_88200 \|\
	SNDRV_PCM_RATE_96000)


	#define WM8776_FORMATS (SNDRV_PCM_FMTBIT_S16_LE \| SNDRV_PCM_FMTBIT_S20_3LE \|\
	SNDRV_PCM_FMTBIT_S24_LE \| SNDRV_PCM_FMTBIT_S32_LE)

	static struct snd_soc_dai_ops wm8776_dac_ops = {
	.digital_mute = wm8776_mute,
	.hw_params = wm8776_hw_params,
	.set_fmt = wm8776_set_fmt,
	.set_sysclk = wm8776_set_sysclk,
	};

	static struct snd_soc_dai_ops wm8776_adc_ops = {
	.hw_params = wm8776_hw_params,
	.set_fmt = wm8776_set_fmt,
	.set_sysclk = wm8776_set_sysclk,
	};

	struct snd_soc_dai wm8776_dai[] = {
	{
	.name = "WM8776 Playback",
	.id = WM8776_DAI_DAC,
	.playback = {
	.stream_name = "Playback",
	.channels_min = 2,
	.channels_max = 2,
	.rates = WM8776_RATES,
	.formats = WM8776_FORMATS,
	},
	.ops = &wm8776_dac_ops,
	},
	{
	.name = "WM8776 Capture",
	.id = WM8776_DAI_ADC,
	.capture = {
	.stream_name = "Capture",
	.channels_min = 2,
	.channels_max = 2,
	.rates = WM8776_RATES,
	.formats = WM8776_FORMATS,
	},
	.ops = &wm8776_adc_ops,
	},
	};
	EXPORT_SYMBOL_GPL(wm8776_dai);

	#ifdef CONFIG_PM
	static int wm8776_suspend(struct platform_device *pdev, pm_message_t state)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;

	wm8776_set_bias_level(codec, SND_SOC_BIAS_OFF);

	return 0;
	}

	static int wm8776_resume(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec = socdev->card->codec;
	int i;
	u8 data[2];
	u16 *cache = codec->reg_cache;

	/* Sync reg_cache with the hardware */
	for (i = 0; i < ARRAY_SIZE(wm8776_reg); i++) {
	if (cache[i] == wm8776_reg[i])
	continue;
	data[0] = (i << 1) \| ((cache[i] >> 8) & 0x0001);
	data[1] = cache[i] & 0x00ff;
	codec->hw_write(codec->control_data, data, 2);
	}

	wm8776_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	return 0;
	}
	#else
	#define wm8776_suspend NULL
	#define wm8776_resume NULL
	#endif

	static int wm8776_probe(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);
	struct snd_soc_codec *codec;
	int ret = 0;

	if (wm8776_codec == NULL) {
	dev_err(&pdev->dev, "Codec device not registered\n");
	return -ENODEV;
	}

	socdev->card->codec = wm8776_codec;
	codec = wm8776_codec;

	/* register pcms */
	ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
	if (ret < 0) {
	dev_err(codec->dev, "failed to create pcms: %d\n", ret);
	goto pcm_err;
	}

	snd_soc_add_controls(codec, wm8776_snd_controls,
	ARRAY_SIZE(wm8776_snd_controls));
	snd_soc_dapm_new_controls(codec, wm8776_dapm_widgets,
	ARRAY_SIZE(wm8776_dapm_widgets));
	snd_soc_dapm_add_routes(codec, routes, ARRAY_SIZE(routes));

	return ret;

	pcm_err:
	return ret;
	}

	/* power down chip */
	static int wm8776_remove(struct platform_device *pdev)
	{
	struct snd_soc_device *socdev = platform_get_drvdata(pdev);

	snd_soc_free_pcms(socdev);
	snd_soc_dapm_free(socdev);

	return 0;
	}

	struct snd_soc_codec_device soc_codec_dev_wm8776 = {
	.probe = wm8776_probe,
	.remove = wm8776_remove,
	.suspend = wm8776_suspend,
	.resume = wm8776_resume,
	};
	EXPORT_SYMBOL_GPL(soc_codec_dev_wm8776);

	static int wm8776_register(struct wm8776_priv *wm8776,
	enum snd_soc_control_type control)
	{
	int ret, i;
	struct snd_soc_codec *codec = &wm8776->codec;

	if (wm8776_codec) {
	dev_err(codec->dev, "Another WM8776 is registered\n");
	ret = -EINVAL;
	goto err;
	}

	mutex_init(&codec->mutex);
	INIT_LIST_HEAD(&codec->dapm_widgets);
	INIT_LIST_HEAD(&codec->dapm_paths);

	snd_soc_codec_set_drvdata(codec, wm8776);
	codec->name = "WM8776";
	codec->owner = THIS_MODULE;
	codec->bias_level = SND_SOC_BIAS_OFF;
	codec->set_bias_level = wm8776_set_bias_level;
	codec->dai = wm8776_dai;
	codec->num_dai = ARRAY_SIZE(wm8776_dai);
	codec->reg_cache_size = WM8776_CACHEREGNUM;
	codec->reg_cache = &wm8776->reg_cache;

	memcpy(codec->reg_cache, wm8776_reg, sizeof(wm8776_reg));

	ret = snd_soc_codec_set_cache_io(codec, 7, 9, control);
	if (ret < 0) {
	dev_err(codec->dev, "Failed to set cache I/O: %d\n", ret);
	goto err;
	}

	for (i = 0; i < ARRAY_SIZE(wm8776_dai); i++)
	wm8776_dai[i].dev = codec->dev;

	ret = wm8776_reset(codec);
	if (ret < 0) {
	dev_err(codec->dev, "Failed to issue reset: %d\n", ret);
	goto err;
	}

	wm8776_set_bias_level(codec, SND_SOC_BIAS_STANDBY);

	/* Latch the update bits; right channel only since we always
	* update both. */
	snd_soc_update_bits(codec, WM8776_HPRVOL, 0x100, 0x100);
	snd_soc_update_bits(codec, WM8776_DACRVOL, 0x100, 0x100);

	wm8776_codec = codec;

	ret = snd_soc_register_codec(codec);
	if (ret != 0) {
	dev_err(codec->dev, "Failed to register codec: %d\n", ret);
	goto err;
	}

	ret = snd_soc_register_dais(wm8776_dai, ARRAY_SIZE(wm8776_dai));
	if (ret != 0) {
	dev_err(codec->dev, "Failed to register DAIs: %d\n", ret);
	goto err_codec;
	}

	return 0;

	err_codec:
	snd_soc_unregister_codec(codec);
	err:
	kfree(wm8776);
	return ret;
	}

	static void wm8776_unregister(struct wm8776_priv *wm8776)
	{
	wm8776_set_bias_level(&wm8776->codec, SND_SOC_BIAS_OFF);
	snd_soc_unregister_dais(wm8776_dai, ARRAY_SIZE(wm8776_dai));
	snd_soc_unregister_codec(&wm8776->codec);
	kfree(wm8776);
	wm8776_codec = NULL;
	}

	#if defined(CONFIG_SPI_MASTER)
	static int wm8776_spi_write(struct spi_device spi, const char data, int len)
	{
	struct spi_transfer t;
	struct spi_message m;
	u8 msg[2];

	if (len <= 0)
	return 0;

	msg[0] = data[0];
	msg[1] = data[1];

	spi_message_init(&m);
	memset(&t, 0, (sizeof t));

	t.tx_buf = &msg[0];
	t.len = len;

	spi_message_add_tail(&t, &m);
	spi_sync(spi, &m);

	return len;
	}

	static int __devinit wm8776_spi_probe(struct spi_device *spi)
	{
	struct snd_soc_codec *codec;
	struct wm8776_priv *wm8776;

	wm8776 = kzalloc(sizeof(struct wm8776_priv), GFP_KERNEL);
	if (wm8776 == NULL)
	return -ENOMEM;

	codec = &wm8776->codec;
	codec->control_data = spi;
	codec->hw_write = (hw_write_t)wm8776_spi_write;
	codec->dev = &spi->dev;

	dev_set_drvdata(&spi->dev, wm8776);

	return wm8776_register(wm8776, SND_SOC_SPI);
	}

	static int __devexit wm8776_spi_remove(struct spi_device *spi)
	{
	struct wm8776_priv *wm8776 = dev_get_drvdata(&spi->dev);

	wm8776_unregister(wm8776);

	return 0;
	}

	static struct spi_driver wm8776_spi_driver = {
	.driver = {
	.name = "wm8776",
	.bus = &spi_bus_type,
	.owner = THIS_MODULE,
	},
	.probe = wm8776_spi_probe,
	.remove = __devexit_p(wm8776_spi_remove),
	};
	#endif /* CONFIG_SPI_MASTER */

	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	static __devinit int wm8776_i2c_probe(struct i2c_client *i2c,
	const struct i2c_device_id *id)
	{
	struct wm8776_priv *wm8776;
	struct snd_soc_codec *codec;

	wm8776 = kzalloc(sizeof(struct wm8776_priv), GFP_KERNEL);
	if (wm8776 == NULL)
	return -ENOMEM;

	codec = &wm8776->codec;
	codec->hw_write = (hw_write_t)i2c_master_send;

	i2c_set_clientdata(i2c, wm8776);
	codec->control_data = i2c;

	codec->dev = &i2c->dev;

	return wm8776_register(wm8776, SND_SOC_I2C);
	}

	static __devexit int wm8776_i2c_remove(struct i2c_client *client)
	{
	struct wm8776_priv *wm8776 = i2c_get_clientdata(client);
	wm8776_unregister(wm8776);
	return 0;
	}

	static const struct i2c_device_id wm8776_i2c_id[] = {
	{ "wm8776", 0 },
	{ }
	};
	MODULE_DEVICE_TABLE(i2c, wm8776_i2c_id);

	static struct i2c_driver wm8776_i2c_driver = {
	.driver = {
	.name = "wm8776",
	.owner = THIS_MODULE,
	},
	.probe = wm8776_i2c_probe,
	.remove = __devexit_p(wm8776_i2c_remove),
	.id_table = wm8776_i2c_id,
	};
	#endif

	static int __init wm8776_modinit(void)
	{
	int ret;
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	ret = i2c_add_driver(&wm8776_i2c_driver);
	if (ret != 0) {
	printk(KERN_ERR "Failed to register WM8776 I2C driver: %d\n",
	ret);
	}
	#endif
	#if defined(CONFIG_SPI_MASTER)
	ret = spi_register_driver(&wm8776_spi_driver);
	if (ret != 0) {
	printk(KERN_ERR "Failed to register WM8776 SPI driver: %d\n",
	ret);
	}
	#endif
	return 0;
	}
	module_init(wm8776_modinit);

	static void __exit wm8776_exit(void)
	{
	#if defined(CONFIG_I2C) \|\| defined(CONFIG_I2C_MODULE)
	i2c_del_driver(&wm8776_i2c_driver);
	#endif
	#if defined(CONFIG_SPI_MASTER)
	spi_unregister_driver(&wm8776_spi_driver);
	#endif
	}
	module_exit(wm8776_exit);

	MODULE_DESCRIPTION("ASoC WM8776 driver");
	MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
	MODULE_LICENSE("GPL");